Update: Apple has now added more steps to try and get your iPhone unfrozen …

Apple’s iOS 9 release went pretty smoothly all things considered, apart from initial server glitches and some performance issues on older devices. There was one big bug however, affecting a lot of people. After updating, the iPhone, iPad or iPod touch would freeze or get stuck on the ‘Slide to Upgrade’ screen. There was seemingly no way to get around it. Apple has now acknowledged the issue and published a fix … here’s the solution: